73-87 Chevy _ GMC Trucks > Instrumentation

Factory speedo gears?

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JohnnyPopper:
Yes! An invention credited to Nicolas Tesla.

One of many ideas that he never patented... 8)

Chevygold:
I used one of the online calculators to determine which gears I needed when I swapped my broken TH350 for a 400, I measured my tyre radius from centre to the road, put in the diff ratio and went for the suggested gears and it came out spot on, my TH350 had an adaptor but I did away with it for the 400.
Graham

Scaryfastatx:
I'm still waiting on the cheapo tach I ordered to come in

But based on the factory specs for the Speedo gear usage and the specified tire size and rear Gear ratio, I'm pretty certain there truck has 4.11 gears out back

I'm gonna jack it up this weekend and spin the drive shaft to verify

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